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RISS 인기검색어
- 검색키워드
- 저자 : R. Sivasubramanian (검색결과 3 건)
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R.G. Joshi,K.K. Mishra,V. Sivasubramanian,B.V.R. Tata 한국물리학회 2016 Current Applied Physics Vol.16 No.10
We report the propagation of sound waves in a suspension of dense thermo-responsive poly(N-isopropyl acrylamide) (PNIPAM) microgels as a function of temperature using Brillouin light scattering. In the dense PNIPAM microgel glass, a single longitudinal acoustic (LA) mode is found to propagate at the velocity intermediate between that of polymer and water phases, and is attributed to the sound wave propagating through the water-microgel composite media. The LA mode shows two interesting features with respect to temperature: i) frequency of LA mode increases upon increase in temperature with anomalous behavior in the vicinity of glass transition and volume phase transition temperatures, ii) the width of LA mode shows minimum near volume phase transition temperature. These observations are attributed to the variation of size and elasticity of PNIPAM microgel particles with temperature. At room temperature the static and dynamic light scattering (DLS) studies on dense PNIPAM microgel suspension confirm a glassy state. In addition, DLS is used to identify the volume phase transition of microgels and glass transition of dense suspension. These temperatures corresponding to glass transition and volume phase transition are found to be consistent with that obtained from Brillouin light scattering results.
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M. Jayaraman,R. Sivasubramanian,S. Babu,V. Balasubramanian 대한금속·재료학회 2009 METALS AND MATERIALS International Vol.15 No.2
Fusion welding of cast A319 (Al-Si-Cu) alloy will lead to many problems including porosity, micro-fissuring, and hot cracking. Friction Stir Welding (FSW) can be used to weld A319 alloy without these defects. In this investigation, an attempt has been made to study the effect of FSW process parameters on the tensile strength of A319 alloy welded joints. Joints were made using different combinations of tool rotation speed, welding speed, and axial force, each at four levels. The quality of weld zone was analyzed using macrostructure and microstructure analysis. Tensile strength of the joints were evaluated and correlated with the weld zone microstructure. The joint fabricated with a 1200 rpm tool rotation speed, 40 mm/min welding speed, and 4 kN axial force showed superior tensile strength compared with the other joints. Fusion welding of cast A319 (Al-Si-Cu) alloy will lead to many problems including porosity, micro-fissuring, and hot cracking. Friction Stir Welding (FSW) can be used to weld A319 alloy without these defects. In this investigation, an attempt has been made to study the effect of FSW process parameters on the tensile strength of A319 alloy welded joints. Joints were made using different combinations of tool rotation speed, welding speed, and axial force, each at four levels. The quality of weld zone was analyzed using macrostructure and microstructure analysis. Tensile strength of the joints were evaluated and correlated with the weld zone microstructure. The joint fabricated with a 1200 rpm tool rotation speed, 40 mm/min welding speed, and 4 kN axial force showed superior tensile strength compared with the other joints.
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Efficient Spectrum Allocation with Survivability Technique in Elastic Optical Networks
Pushpanathan Krishnamoorthy,Sivasubramanian Arunagiri,Jawahar Arumugam,Jesuwanth Sugesh R.G,MenaghaPriya.B.R 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.3
In recent years, traffic requirement with variable bit rates and Quality of Service due to online High Definition video streaming, downloading movies and transferring of files are being satisfied with Elastic Optical Network (EON). Most efficient spectrum utilization is required to satisfy the demand with minimum blocking probability. The network is unstable and a small failure can lead to tremendous loss of data, hence survivability is mandatory. Slot Capacity based Spectrum Allocation with Survivability (SCSAS) algorithm is proposed which aims at the efficient spectrum utilization and configuration of protection paths. Duty Cycle Division Multiplexing (DCDM) and hop based modulation technique are also introduced to manage the spectrum which further reduces the spectrum wastage. The formation of spectrum fragments on the termination of existing requests increases the blocking probability. In order to improve the spectrum utilization, a spectrum defragmentation technique is introduced in the proposed work. Dynamic configuration of backup paths provides survivability. Results show an increase in free spectrum for dynamic requests, lesser spectrum wastage, and reduced blocking probability than the traditional algorithms such as fixed, flexible and random spectrum allocation.
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